Plasmons in the van der Waals charge-density-wave material 2H-TaSe2

Chaoyu Song, Xiang Yuan, Ce Huang, Shenyang Huang, Qiaoxia Xing, Chong Wang, Cheng Zhang, Yuangang Xie, Yuchen Lei, Fanjie Wang, Lei Mu, Jiasheng Zhang, Faxian Xiu and Hugen Yan ()
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Chaoyu Song: Fudan University
Xiang Yuan: Fudan University
Ce Huang: Fudan University
Shenyang Huang: Fudan University
Qiaoxia Xing: Fudan University
Chong Wang: Fudan University
Cheng Zhang: Fudan University
Yuangang Xie: Fudan University
Yuchen Lei: Fudan University
Fanjie Wang: Fudan University
Lei Mu: Fudan University
Jiasheng Zhang: Fudan University
Faxian Xiu: Fudan University
Hugen Yan: Fudan University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Plasmons in two-dimensional (2D) materials beyond graphene have recently gained much attention. However, the experimental investigation is limited due to the lack of suitable materials. Here, we experimentally demonstrate localized plasmons in a correlated 2D charge-density-wave (CDW) material: 2H-TaSe2. The plasmon resonance can cover a broad spectral range from the terahertz (40 μm) to the telecom (1.55 μm) region, which is further tunable by changing thickness and dielectric environments. The plasmon dispersion flattens at large wave vectors, resulted from the universal screening effect of interband transitions. More interestingly, anomalous temperature dependence of plasmon resonances associated with CDW excitations is observed. In the CDW phase, the plasmon peak close to the CDW excitation frequency becomes wider and asymmetric, mimicking two coupled oscillators. Our study not only reveals the universal role of the intrinsic screening on 2D plasmons, but also opens an avenue for tunable plasmons in 2D correlated materials.

Date: 2021
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DOI: 10.1038/s41467-020-20720-0

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